引信在长期贮存下老化行为的仿真模拟与分析

目的厘清某型引信在贮存14 a后的失效模式,研究温度周期性交变对引信及其薄弱零件的影响。方法利用ANSYS workbench软件,建立基于时间硬化的蠕变仿真方法。以某型引信为研究对象,开展周期性温度交变的蠕变仿真,根据仿真计算结果和实物的对比分析,找出薄弱零件,分析其老化失效模式。结果在每个周期内环境温度循环条件下,仿真时长设定为14 a,结果显示,引信整体蠕变应变率超过1%,平均压紧应力下降21%,松弛稳定性变弱,密封性在一定程度上变差。其中,引信电机外壳、电机扇叶、底部线路对接板为薄弱零件,容易发生失效行为。结论引信贮存在典型西南湿热环境14 a后,周期性温度交变应力将导致引信出现缺陷,缺陷集中在电机外壳、电机扇叶、底部线路对接板处,应重点对这些部位进行防护。

Simulation and Analysis of Aging Behavior of Fuzes under Long-term Storage

The work aims to clarify the failure mode of a certain type of fuze after 14 years of storage, and to study the effect of periodic temperature alternation on the fuze and its weak parts. A creep simulation method based on time hardening was established with ANSYS workbench. With a certain type of fuze as the research object, the creep simulation of periodic temperature alternation was carried out. According to the simulation calculation results, the weak parts were found and the aging failure mode was analyzed. Under the cyclic condition of ambient temperature in each cycle, the simulation time was set to 14 year. The results showed that the overall creep strain rate of the fuze exceeded 1%, the average compressive stress decreased by 21%, the relaxation stability became weaker, and the sealing became poor, among which the fuze motor housing, motor fan blade and bottom line docking plate were weak parts and were prone to failure behavior. After the fuze is stored in a southwestern hygrothermal environment for 14 years, the periodic temperature alternating stress will lead to defects in the fuze, and the defects are concentrated in the motor shell, motor fan blade and bottom line docking plate. Therefore, these parts should be protected.